Lawmakers on the House Intelligence Committee want to know how the FBI investigation that led to Petraeus' resignation came about, according to a senior congressional staffer who spoke anonymously because he was not authorized to discuss the investigation publicly.

Members of the Senate intelligence committee have similar questions.

FBI officials say the committees weren't informed because the investigation started as a criminal probe into harassing e-mails sent by Petraeus' paramour, a 40-year-old graduate of the U.S. Military Academy and an Army Reserve officer, to another woman.

Online Public Information File

Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or fccinfo@fcc.gov.